From 9344f50755a07e398ea34c0180232cdc32a9bd1f Mon Sep 17 00:00:00 2001
From: Sean Whitton <spwhitton@spwhitton.name>
Date: Thu, 2 Apr 2015 17:57:53 +0900
Subject: parse absolute times on the command line

---
 src/Main.hs | 34 ++++++++++++++++++++++++++--------
 srem.cabal  |  1 +
 2 files changed, 27 insertions(+), 8 deletions(-)

diff --git a/src/Main.hs b/src/Main.hs
index e09ba9b..c4b33e3 100644
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -27,7 +27,9 @@ import           Data.List           (intercalate)
 import           System.Environment  (getArgs)
 
 import           Data.Time.Calendar
+import           Data.Time.Format
 import           Data.Time.LocalTime
+import           System.Locale       (defaultTimeLocale)
 import           Text.Regex.Posix    ((=~))
 
 import           Types.Reminder
@@ -43,15 +45,31 @@ doCron                  = do
         nowRems         = filter nowRemsFilter rems
     mapM_ sendNotification nowRems
 
-cmdLineReminder                 :: [String] -> Maybe Reminder
-cmdLineReminder []              = Nothing
-cmdLineReminder [_]             = Nothing
-cmdLineReminder (exp:textParts) = do
-    undefined
+cmdLineReminder             :: [String] -> Maybe Reminder
+cmdLineReminder []          = Nothing
+cmdLineReminder [_]         = Nothing
+cmdLineReminder (exp:textParts)
+    | exp =~ relativeRegExp :: Bool = do
+                                          (h, m) <- parseRelativeTime exp -- TODO: add to current time
+                                          makeReminder h m text
+    | exp =~ absoluteRegExp :: Bool = do
+                                          (h, m) <- parseAbsoluteTime exp
+                                          makeReminder h m text
+    | otherwise             = Nothing
   where
-    text                        = intercalate " " textParts
-    relativeRegExp              = "[0-9]+[mh]"
-    absoluteRegExp              = "[0-9]{1,2}(:[0-9][0-9])?(am|pm)?"
+    text                    = intercalate " " textParts
+    relativeRegExp          = "[0-9]+[mh]"
+    absoluteRegExp          = "[0-9]{1,2}(:[0-9][0-9])?(am|pm)?"
+
+parseRelativeTime     :: String -> Maybe (Hour, Minute)
+parseRelativeTime exp = undefined
+
+parseAbsoluteTime     :: String -> Maybe (Hour, Minute)
+parseAbsoluteTime exp = let formatString = if last exp == 'm'
+                                           then "%k:%M%P"
+                                           else "%k:%M"
+                        in parseTime defaultTimeLocale formatString exp
+                           >>= \tod -> Just (todHour tod, todMin tod)
 
 appendUserReminder   :: Reminder -> IO ()
 appendUserReminder r = do
diff --git a/srem.cabal b/srem.cabal
index 80fac73..6b42a57 100644
--- a/srem.cabal
+++ b/srem.cabal
@@ -20,5 +20,6 @@ executable srem
                      , time
                      , filepath
                      , split
+                     , old-locale
   hs-source-dirs:      src
   default-language:    Haskell2010
-- 
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